bug#16969: Isearch: lazy-highlight face sometimes has foreground and background the same colour.

[Alan Mackenzie]

Hi, Emacs.

In isearch.el, the face `lazy-highlight' is defined with only a
:background colour, e.g. turquoise3.  On a Linux tty, this is cyan.

When the text which has a lazy match itself has a cyan foreground
colour, the lazy highlighting leaves the cyan text on a cyan background
invisible.  This happens, for example, on the Linux tty when searching
through an Info menu.  This is surely a bug.

An effective solution would be to give the `lazy-highlight' face a
foreground colour, e.g. black.

-- 
Alan Mackenzie (Nuremberg, Germany).